--->
Well it appears that I might have supplied you with outdated information. According to their web site:
http://support.apple.com/kb/HT4759
 
Apple dropped support for reading list synchronization with windows completely after discontinuing the windows version of Safari. Today Safari won't even sync bookmarks to it's windows counterpart, it only supports IE, Firefox and Chrome.
 
So sorry about that, it is just that it used to work for me when I was using iPhone (something like two years ago) and I had no idea that the framework changed. If you'd like you can try it anyhow, maybe it still works but just not officially listed: In the iPhone, go to settings and in iCloud settings enable bookmarks and reading list synchronization, and try to do the same in the iCloud plugin for windows.